package birthmonth;
import java.util.*;
public class BirthMonth {
public static void main(String[] args) {
int num1 = 0, num2 = 0;
HashSet group1 = new HashSet();
HashSet group2 = new HashSet();
HashSet self = new HashSet();
Scanner scan = new Scanner(System.in);
for(int a = 0; a <= 6; a++){
if(a > 0 && a <= 3){
num1++;
System.out.print("Enter birth month "+num1+": ");
String month1 = scan.next();
group1.add(month1);
}else if(a > 3 && a <= 6){
num2++;
System.out.print("Enter birth month "+num2+": ");
String month2 = scan.next();
group2.add(month2);
}
}
HashSet union = new HashSet(group1);
HashSet inter = new HashSet(group1);
HashSet diff = new HashSet(group1);
union.addAll(group2);
union.retainAll(group2);
diff.removeAll(group2);
System.out.println("Group 1: "+group1);
System.out.println("Group 2: "+group2);
System.out.print("Enter your birth month: ");
String mine = scan.next();
self.add(mine);
System.out.println("Union: "+union);
System.out.println("Intersection: "+inter);
System.out.println("Difference: "+diff);
if(group1.containsAll(self)|| group2.containsAll(self)){
System.out.println("You have the same birth month with atleast one
of your classmates.");
}else{
System.out.println("You don't have the same birth month with one of
your classmates.");
}
}
}
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https://www.coursehero.com/file/75624225/BirthMonthjava/
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